Make sure the cable from the tablet to the controller is good-- there have been numerous reports on the forum of bad cables.The problem is that the camera no longer works (just hangs in the down position and no video). There is no indication of any of the data ie. Battery level, height, distance, speed etc. I'm not comfortable flying it and not particularly interested in losing it.
If you have not, remove the firmware from the SD card.
Make sure the cable from the tablet to the controller is good-- there have been numerous reports on the forum of bad cables.